MF-RHT070-0 Equivalent & Substitute Parts

Part Overview

The MF-RHT070-0 is a polymeric PTC resettable fuse manufactured by Bourns Inc. under the Multifuse® series. This component is rated for 16V maximum voltage with a 700 mA hold current and is designed for through-hole radial mounting in disc configuration. The part is currently in active production status with AEC-Q200 ratings and ROHS3 compliance.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while accommodating different voltage ratings, lead spacing, or manufacturer sourcing requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Max	16	V
Current - Hold (Ih) (Max)	700	mA
Current - Trip (It)	1.4	A
Current - Max	40	A
Time to Trip	4	s
Resistance - Initial (Ri) (Min)	300	mOhms
Resistance - Post Trip (R1) (Max)	800	mOhms
Operating Temperature Range	-40 to 125	°C
Mounting Type	Through Hole	—
Package / Case	Radial, Disc	—
Size / Dimension	0.270" L x 0.118" W (6.86mm x 3.00mm)	—
Height - Seated (Max)	0.425" (10.80mm)	—
Lead Spacing	0.114" (2.90mm)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

The RHEF070 manufactured by Littelfuse is identified as a substitute for the MF-RHT070-0 based on the following electrical and mechanical compatibility criteria:

Matching Parameters:

Current - Hold (Ih) (Max): 700 mA (identical)
Current - Trip (It): 1.4 A (identical)
Current - Max: 40 A (identical)
Resistance - Initial (Ri) (Min): 300 mOhms (identical)
Resistance - Post Trip (R1) (Max): 800 mOhms (identical)
Operating Temperature Range: -40°C to 125°C (identical)
Mounting Type: Through Hole (identical)
Package / Case: Radial, Disc (identical)
RoHS Status: ROHS3 Compliant (identical)

Differing Parameters:

Voltage - Max: 30V (RHEF070) vs. 16V (MF-RHT070-0)
Time to Trip: 3.2 s (RHEF070) vs. 4 s (MF-RHT070-0)
Lead Spacing: 0.199" (5.05mm) (RHEF070) vs. 0.114" (2.90mm) (MF-RHT070-0)
Size / Dimension: 0.272" L x 0.118" W (6.90mm x 3.00mm) (RHEF070) vs. 0.270" L x 0.118" W (6.86mm x 3.00mm) (MF-RHT070-0)

The RHEF070 provides higher voltage rating and faster trip response, making it suitable for applications where the MF-RHT070-0 is unavailable, provided circuit board layout accommodates the increased lead spacing.

Parameter Comparison

Parameter	MF-RHT070-0 (Bourns)	RHEF070 (Littelfuse)
Manufacturer	Bourns Inc.	Littelfuse
Series	Multifuse®, MF-RHT	PolySwitch®, RHEF
Product Status	Active	Active
Type	Polymeric	Polymeric
Voltage - Max	16V	30V
Current - Hold (Ih) (Max)	700 mA	700 mA
Current - Trip (It)	1.4 A	1.4 A
Current - Max	40 A	40 A
Time to Trip	4 s	3.2 s
Resistance - Initial (Ri) (Min)	300 mOhms	300 mOhms
Resistance - Post Trip (R1) (Max)	800 mOhms	800 mOhms
Operating Temperature	-40°C to 125°C	-40°C to 125°C
Mounting Type	Through Hole	Through Hole
Package / Case	Radial, Disc	Radial, Disc
Size / Dimension	0.270" L x 0.118" W (6.86mm x 3.00mm)	0.272" L x 0.118" W (6.90mm x 3.00mm)
Height - Seated (Max)	0.425" (10.80mm)	0.425" (10.80mm)
Lead Spacing	0.114" (2.90mm)	0.199" (5.05mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	AEC-Q200	CSA, TUV, UL

Engineering Selection Recommendations

Both the MF-RHT070-0 and RHEF070 maintain active production status and comply with ROHS3 environmental standards. The MF-RHT070-0 carries AEC-Q200 automotive qualification, while the RHEF070 holds CSA, TUV, and UL certifications.

Selection between these parts depends on circuit board layout constraints and voltage system requirements. The MF-RHT070-0 is specified for 16V maximum systems with tighter lead spacing of 0.114" (2.90mm). The RHEF070 accommodates 30V maximum systems and features wider lead spacing of 0.199" (5.05mm), with a faster trip response of 3.2 seconds compared to 4 seconds for the MF-RHT070-0.

Frequently Asked Questions (FAQ)

Q: Can the RHEF070 be used as a direct replacement for the MF-RHT070-0?

A: The RHEF070 is electrically compatible for hold current, trip current, and resistance specifications. However, the increased lead spacing (0.199" vs. 0.114") requires circuit board layout verification. The higher voltage rating (30V vs. 16V) is backward compatible with 16V systems.

Q: What is the significance of the different lead spacing?

A: Lead spacing determines the distance between solder pads on the circuit board. The MF-RHT070-0 requires 0.114" (2.90mm) spacing, while the RHEF070 requires 0.199" (5.05mm) spacing. Existing board layouts designed for the MF-RHT070-0 may not accommodate the RHEF070 without modification.

Q: How do the trip times differ between these parts?

A: The MF-RHT070-0 trips in 4 seconds, while the RHEF070 trips in 3.2 seconds. Both operate within the same hold current and trip current specifications. The faster response of the RHEF070 may affect circuit protection timing in applications with specific response requirements.

Q: Are both parts suitable for automotive applications?

A: The MF-RHT070-0 carries AEC-Q200 qualification for automotive use. The RHEF070 holds CSA, TUV, and UL certifications. Application requirements determine which certification is necessary.

Q: What is the packaging difference between these parts?

A: The MF-RHT070-0 is supplied in bulk packaging, while the RHEF070 is supplied in bag packaging. This affects inventory management and component handling but does not impact electrical or mechanical performance.

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